Add a title in the heading to match the main menu text

app/views/messages/inbox.html.erb

@@ -5,6 +5,7 @@
 <% content_for :heading_class, "pb-0" %>
 
 <% content_for :heading do %>
+  <h1><%= t("users.show.my messages") %></h1>
   <ul class="nav nav-tabs">
     <li class="nav-item">
       <a class="nav-link active"><%= t ".my_inbox" %></a>

app/views/messages/outbox.html.erb

@@ -5,6 +5,8 @@
 <% content_for :heading_class, "pb-0" %>
 
 <% content_for :heading do %>
+  <h1><%= t("users.show.my messages") %></h1>
+
   <ul class="nav nav-tabs">
     <li class="nav-item">
       <%= link_to t(".my_inbox"), inbox_messages_path, :class => "nav-link" %>